Indeed, the pins CA1 and CB1 are *not* wired on the
board ...
back to the 11/70 thread with this result.
Perhaps to state the obvious: this means, of course, that unless you wired
these two pins together on the slot the RX11 is in, the RX11 would *break*
the NPR chain!
Jay Jaeger
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Jay R. Jaeger The Computer Collection
cube1(a)charter.net